Tube-skiving apparatus



Patented -July l2, 1927.

UNITED STATES PATENT OFFICE.4

ABRAM,E.- FALOR, OF AKRON, OHIO, ASSIGNOR TO THE B. F. GOODRIGH COMPANY,OF

NEW YORK, N. Y., A CORPORATION OF NEW YORK.

TUBE-SKIVIN G APPARATUS.

Application filed May 19,

This invention relates to tube skiving machines, particularly to amachine for skiving' l the ends of a length of tubular stockprepaheretofore has been possible.

The accompanying drawings illustrate the invention.

Fig. 1 is a view in elevation of a machine embodying a preferred form ofmy invention' v l Fig. 2 is a view in longitudinal section through theoperative parts of the machine;

Fig.- 3 is a view in section through the suction valve of the machine;and

Fig. 4 illustrates a tube the end of which has been skived or beveled bymeans-of my improved machine.

My invention in substance involves a suction means for holding securelythe end of a thin rubber tube in a turned-back or cuifed condition on amandrel which is movable into operative cutting position with respect toa rotating, tubular knife for skiving of the vend thereof to betteradapt thetube end for splicing, and in the specific form illustra-tedcomprises a hollow frusto-conical member or nozzle'having a foraminousouter wall portion upon which the tube is folded back and an enlargedportion vformin a shoulder with the foraminous portion against whichshoulder the tube end is placed prior to the sk'ivin operation. Theerforations of the foraminous wall communicate with a chamber formedwithin the hollow frustoconical nozzle and a valve-controlled conduitconnected with a suction line serves to evacu. ate the chamber when thenozzle'is moved into operative-striving position and to break the vacuumwhen the nozzle is retracted therefrom. In prior constructions, it hasbeen the practice to make the mandrel on which the'tube end is foldedback much larger than the tube beingbeveled and to stretch the, tube endover the mandrel relying upon the elasticity of the tube to hold itthereon during skiviiig. In such constructions there is a considerablesli page of the tube about the mandrel whic causes 0b- 1924. Serial No.v714,415.l

jectionable irregularities in the bevel. In

attempts to minimize this slippage, the

beveled cut is made at a considerable distance from the tube end,l thuswasting a considera'ble amount of material. 'The present apparatusfirmly holds the material being cut or beveled by vacuum pressure fromwithin and thus permits the cutting operation to be performed at thevery end of the tube 'with a. great saving of material and with theproduction of a clean, uniform bevel. Further, the nozzle bein ofsubstantially .the size of the tubing, t e tubing is readily slipped onand off the nozzle saving much time .and labor in this operation.

Referring to the drawings, I show my tube skiving machine mounted upon atable 10 having a pedestal support 11. The machine consists essentiallyof a rotating knife 12, a motor 13 operatively connected thereto as byshaft 14, and a mandrel 15 movable in the direction of the axis ofrotation of the knife, all being of conventional construction inmachines of this character.

The mandrel 15 comprises a bracket member 16 slidably supportedon table10 and a nozzle member 17. The nozzle/17 includes a frusto-conical noseportion 18 and a cylindrical shank portion 19, the latter secured in thebracket 16, and is provided with an axial opening. 20 for the receptionof the 'tube 21 to be skived. A shoulder 22 rises abruptly from the nose18 to the shank 19 and serves for the positioning of the tiibe 21, ashere. inafter described. A

The annular wallof the mandrel 15 is constructed to provide therein anannular chamber 25 coextensive with the. axial length of the nose 18 andwhich may extend through the shank 19 if desired. The outer wall of thenose 18 is provided with 'a plurality of apertures 26,communicating'with the chamber 25 and so spaced as to make the outerwall foraminous in-character, as illustrated in Fig.v 1. A

The mandrell has formed in the base of v chamber ol the mandrel 15 bymeans of a flexible conduit 40, and a port dlleading' Adirectly to theatmosphere. The setting ot the pinion 29, shaft 30, and valve 33 is suchthat When the crank arm is moved to ady vance the mandrel 15 toward theknife 12 atmosphere through port 41." A vacuumthe port 41 is closed andthen the port 3l', opened to place the chamber Q5 in commumcation withthe suction line 38, and conversely at the completion of the retractedposition of the mandrel 15 the port i7 to the suction line is closed andthe chamber 2 then placed in communication with the pressure is thusmaintained in chamber 25 for holding -the tube end firmly to the nose 1Sduring the skiving action and immediately before and after this action.The vacuum is` automatically broken, however, at the outermost positionof'the mandrel 15, so

that the positioning and removing of the `'tube may be readilyaccomplished.

Theo eration of the above described machine is rieily as follows: Withthe mandrel in theouter retracted ositionshpwn in Fig. 1, one end of a'rub r tire'is lnserted through the opening 20ct the mandrel 15 andfolded back over the outer wall of the nose 1S, the margin of the tubeend abutting the shoulder 22. The crank arm is t'hen pulled back toadvance the mandrel 15 and tube carried thereby into operative positionwith respect' to the rotating knife 19.. Upon the first advancingmovements of the mandrel, the chamber 25 is connected to the suctionline 38 through the valve 33 and the vacuum created therein causes theeuiied portion of the tube end to be pressed firmly to the outer wall ofthe nose 18. The vaeuum in chamber 25 is maintained during the skivingoperation and is brolren-only when the mandrel has again been withdrawnto its outer retracted position. The tube with its end properly beveledis then readily removed from the i `andrei, and the machine "is readyfor a succeeding operation.

Modifications may be resorted to within the scope of this invention andI do not wholly limit my claims to the speeio construction shown. e

I claim:

l. In a tube skiving machine, in combination, an annular member providedwith a frusto-conica-l portion adapted to support a tube end, saidfrusto-conical portion being hollow to form a vacuum chamber and being`further provided with passage Ways leading from the vacuum chamberthrough its outer wall, and means for making and breaking a vacuumWithin the vacuum chainber.

2. In a tube skivlng maclnne, in combination, a hollow nozzle externallytapered at one, end and through which the end of a. tube naam/1c adaptedto be passed and to be folded baclr over the externally tapered portion,Vsaid hollow nozzle being provided with passage Ways leading Afrom theinterior thereof to the outer wall of said tapered portion, a rotatingknife adapted to circulnscribc said folded-back portion of the tube andto cut it to form a beveled end, means for rela-` tively moving thenozzle and knife into oper ative cut-ting position andinto a retractedposition, andmeans for intermittently producing a vacuum within saidhollow nozzle and for breaking said vacuum.

3i. In a tube skiving machine, in combination, a rotating knife, anannular mandrel eoaxially disposed with relation to said rotating'knifefor supporting a tube end, the knife and the mandrel being relativelyn1ovable in such manner that the knife and the manldrel may be movedinto operative cutv the knife and the mandrel for holding the tube endlirmlyto the mandrel when in cntting position and ,for releasing theholding action upon retraction, therefrom.

4:. In a tube skivixlgr machine, in combination,' au hollow nozzleexternally tapered at one endl and Vthrough which the end of a tube isadapted to be passed and to be folded back over the externally taperedportion, said hollow nozzle being provided with passage ways leadingfrom 'the interior thereof to the outer wall of said tapered portion, a.rotating knife adapted to circumscribe said folded-back portion of thetube and to cut .it to form a beveled end, means for relatively movingthe nozzle and knife into operative cutting position4 and into aretracted position, and means coordinated with the relative movements ofthe knife and the nozzle for producing evacuum within the nozzle whenthe two are in cutting position and for breaking the vacuum when the twoare in retracted position. 5. In a tube skiving machine, in combina,-tien, a mandrel adapted for'supportin a tube end and having la vacuumcham er therein, said mandrel being further provided with passagewvziysto said chamber-ineI tube holding zone, a rotating knife adapted to cutsaid tube to form a beveled end thereon, means for relatively moving themandrel and the knife into cutting position and into a retractedposition,`and means operative nozzle to cutting position for creating asubatmospheric pressure in said vacuum chamber and for releasing saidpressure in retracted position.

6. In a tube skiving device, a hollow noz zie externally tapered at oneend and through which the end of a tube is adapted to be passed and tobe folded back over the externally tapered portion, a. rotating tubuuponrelative movement of said knife and i through whieh the'end of a-tube isad'a'p `the hold in the retracted position'. 7. 'In.atubehskivingdevice, a hollow nozlar knife l adapted to v:circumseribe saidfolded-back portion and to cut lit to form a beveled. or skived end,means for relative- 1y moving the nozzle and the knife intoo'perativecl'iltting position and intoa retracted position, means operative uponsaid` `into cutting position for holding the tube` end Iirmly to thenozzle and for releasing zle. externally tapered vat one end ang to b'epassed and to be folded `back over the' externally tapered portionfatubular rotan.. ing .knife Y adapted to ciroumaeribe said folded-backportion and to cutit to form a beveled or skived end, means for'movingthe nozzle into operative cutting positionA with respect to the knifevand for with;

drawing the. nozzle from the knife,V and vacuum means operative uponmoving the nozzle into cutting position for holding the 'foldedbaoktubeend firmly to the nozzle.

' SgrIn atube'skiving machine, in combina- ,tion, a hollow nozzleexternally tapered at oneend and through which theend of a'tube isadapted to be passed 'and tovbe folded back f relative movement of thenozzle andkliifegover the externally. tapered portion, said Anozzle'being provided with passageways leading from the interior thereof tothe f outer wall of said tapered portion, a rota-t' ing knife adapted toleiroumsoribe said folded-.back portion of the tubepand adapted to outtheextreme end portion of the tube.

.with a beveled taper, means for relatively' 'i moving the nozzle andknife into operativel cutting position 'and into a retracted position,and means for intermittently producing a vacuuml within saidliollownozzle and for -breaking said vacuum.

p In witness whereof Ihave hereunto set my hand this 16th day of'May,1924.

' ABRAM E. FALOR.-

